Brake



C.HTAYLOR BRAKE Sept. 6, 193.2.

Filed March 28, 1929 LNVEHlR jglyacn. H. TAYLOR Patented Sept. 6, 1932 UNITED STATES PATENT oFFlcEA OECIL H. TAYLOR, OF DETROIT, MICHIGAN, ASSIGNOR TO BENDIX BRAKE COMPANY, OF SOUTH.' BEND, INDIANA, A CORPORATION ILLINOIS BRAKE Application led March 28, 1929. Serial No. 350,528.

This invention relates to brakes, and is illustrated as embodied in an internal expanding brake for an automobile. An obi ject of the invention is to provide a simple but powerful brake, preferably having a servo action in both directions of drum rotation, and which can be manufactured economically. Various features -of novelty relate to the shoe arrangement, to a novel cam lever mounting, to a torsion return spring, and to other desirable constructions which will be apparent from the following description of the illustrative embodiments shown in the accompanying drawing, in which:

Figurel 1 is a vertical section through the brake, just inside the-head of the brake drum, showing the brake shoes in side elevation;

Figure 2 is a similar view of the upper portion of a modified form;

Figure 3 is a partial section onthe line 3 3 of Figure 1, showing oneof the brake anchors;

Figure 4 is a partial section Athrough the applying means on the line 4-4 of Figure 1;

Figure 5 is a partial section en the line 5 5 of Figure 1, showing one of the torsion springs; and p l Figure 6 is a section, on the line 6 6 of Figure 2, through the applying means of this y modification.

The brake includes a rotatable drum 10, at the open side of which' is a support such as a backing plate 12,. and w-ithin which is arranged the friction means of the brake.l

The friction meanspreferably includes a central rigid shoe 14, notched at its ends to engage two anchor posts 16 and 18, and connected at its ends by means such as floating pivots 20 to two end servo shoes 22 and 24. A lower return spring 26, tensioned between shoe 14 and the backing plate, urges shoe 14 against the anchors 16 and 18, while another return spring 28 is tensioned between the shoes 22 and 24.

The weight 'of the shoe assembly is preferably balanced, at least in part by novel torsion springs 30 sleeved on posts 32 carried by the backing plate'. One end of each spring 30 is operatively connected to one of the shoes 22 or 24, and the other end is operatively connected to the backing plate by means such as a small post 34 carried thereb l 1,3 I

yBetween the upper or unconnected ends of shoes 22 and 24 is a fixed post 36, carried by the backing plate, and on which is pivotally supported an operating ,cam lever 38 operatively engaging both shoes, and recessed to fit over the post 36. The lower end of the floating lever 38 is in thrust engagement with an operating lcver'40 mounted on a fixed fulcrum 42 carried by the backing plate. Lever 40 is operated by means such as a tension cable 44 passing through the backing plate through a fitting 46. A

In operation, if the drum is turning 'clockwise when the brakeis applied the shoe 14 anc-hors on the post 16, while i the drum -is turning counter-clockwise the shoe,l 14 anchors on the post 18. Shoes 22 andi'28 have parallel spaced stiffening webs, the'lower end of which straddle the opposite ends of the single web of shoe 14, to facilitate the arrangement of the pivots 20. Pivots 20 may be formed with enlarged heads slidably elngaging the backing plate.

In Figures 2 and 6, the shoes 122 and 124 are steadied by being provided with end f`1t tings or cam plates 50 and 52, having overlapping projections 54 and 56, one preferably having a rounded lug 58 on its side to diminish friction. V

While certain illustrative constructions" have been described in detail, it is not myintention to limit the scope of the invention to those particular embodiments, or otherwise ported by the stop and engagingboth servo shoes.

2. A brake comprising, in combination, a

drum, spaced anchors a rigid shoe engageable with the drum and anchorlng at one end on one anchor when the drum is turning in one direction and at the other end a, when the drum is turning in a reverse direction, a rigid servo shoe operat1vely connected to each end of the firstvshoe, a stop between 'the unconnected ends of the servo shoes, a floating cam lever pivotally supported by the m stop and engaging both servo shoes, and means yieldingly urging the first shoe toward both anchors. l

3. A brake comprising, in combinat1on, an

anchor, a floating shoe, and a torsion sprlng u urging the s'hoe toward an idle position determined b the anchor.

4. lA bra e comprising, in combination, a floating shoe, and a torsion spring urging the shoe toward idle position. r

5. A brake comprising, in combinat1on, a` backing plate, a shoe, a post carried by said A plate adjacent the shoe, and a torsion sprmg sleeved on the post and operatively connected at one end to the backing plate and at its other end to said shoe.

6. A brake comprising, in combination, friction means havin adjacent separable ends, a post between sald ends, a floating cam lever pivotally supported by said post and -ao operatlvely engaging said ends, and a lever plvoted on a ixed fulcrum adjacent the end of the first lever and arranged in operative thrust enga ement with the first lever.

7 A bra e comprising, in combination,

I8 lfriction means having adjacent separable ends, a post between said ends, a floating cam l lever pivotally supported by said post and n operatively enga 'ng said ends, and a lever pivoted on a fixe ulcrum adjacent the end In of the first lever and arranged in operative engagement with the first lever. 1

8. A brake comprising, in combination, friction means having adjacent separable ends, a post between said ends, a floating cam lever having a notch engaging said post and operatively engaging said ends, and a lever pivotedon a fixed fulcrum adjacent the end of the first lever and arranged in operative engagement with the first lever.

l0 9. A brake comprising a backing plate,

friction 'means .having adjacent separable l ends, a post between said ends mounted on the backmg plate, a floating cam lever supported b said post and operatively engaging said enti, and, a lever pivotally secured to the backing plate having one end operatively en aging the cam lever.

testimony whereof, I have hereunto signed my name.

n CECIL H. TAYLOR. 

